Implement hyprland submap module

include/modules/hyprland/submap.hpp

@@ -0,0 +1,25 @@
+#include <fmt/format.h>
+#include "ALabel.hpp"
+#include "bar.hpp"
+#include "modules/hyprland/backend.hpp"
+#include "util/json.hpp"
+
+namespace waybar::modules::hyprland {
+
+class Submap : public waybar::ALabel, public EventHandler {
+ public:
+  Submap(const std::string&, const waybar::Bar&, const Json::Value&);
+  ~Submap();
+
+  auto update() -> void;
+
+ private:
+  void onEvent(const std::string&);
+
+  std::mutex mutex_;
+  const Bar& bar_;
+  util::JsonParser parser_;
+  std::string submap_;
+};
+
+}  // namespace waybar::modules::hyprland